Buggy code:
if ( cls instanceof MClass ) { String interfaces = generateSpecification ( ( ( MClass ) ( cls ) ) ) ; if ( ! ( interfaces . equals ( "" ) ) ) { if ( GeneratorPHP . VERBOSE ) sb . append ( '<seq2seq4repair_space>' ) . append ( "//*<seq2seq4repair_space>implements<seq2seq4repair_space>*//<seq2seq4repair_space>" ) . append ( interfaces ) ; } } sb . append ( "\n{" ) ; tv = generateTaggedValues ( cls ) ; if ( ( tv != null ) && ( ( tv . length ( ) ) > 0 ) ) sb . append ( INDENT ) . append ( tv ) ; String make_constructor = cls . getTaggedValue ( "constructor" ) ; if ( ( make_constructor != null ) && ( make_constructor . equals ( "true" ) ) ) { sb . append ( INDENT ) . append ( "function<seq2seq4repair_space>" ) . append ( cls . getName ( ) ) . append ( "()<seq2seq4repair_space>{\n" ) ; sb . append ( generateSection ( cls ) ) ; sb . append ( INDENT ) . append ( "}\n" ) ; } Collection strs = UmlHelper . getHelper ( ) . getCore ( ) . getAttributes ( cls ) ; if ( strs != null ) { sb . append ( '\n' ) ; if ( cls instanceof MClass ) sb . append ( INDENT ) . append ( "////<seq2seq4repair_space>Attributes\n" ) ; Iterator strEnum = strs . iterator ( ) ; while ( strEnum . hasNext ( ) ) { MStructuralFeature sf = ( ( MStructuralFeature ) ( strEnum . next ( ) ) ) ; sb . append ( '\n' ) . append ( INDENT ) . append ( generate ( sf ) ) ; tv = generateTaggedValues ( sf ) ; if ( ( tv != null ) && ( ( tv . length ( ) ) > 0 ) ) sb . append ( INDENT ) . append ( tv ) . append ( '\n' ) ; } } Collection ends = cls . getAssociationEnds ( ) ; if ( ends != null ) { sb . append ( '\n' ) ; if ( cls instanceof MClass ) sb . append ( INDENT ) . append ( "////<seq2seq4repair_space>Associations\n" ) ; Iterator endEnum = ends . iterator ( ) ; while ( endEnum . hasNext ( ) ) { MAssociationEnd ae = ( ( MAssociationEnd ) ( endEnum . next ( ) ) ) ; MAssociation a = ae . getAssociation ( ) ; sb . append ( '\n' ) . append ( INDENT ) . append ( generateAssociationFrom ( a , ae ) ) ; tv = generateTaggedValues ( a ) ; if ( ( tv != null ) && ( ( tv . length ( ) ) > 0 ) ) sb . append ( INDENT ) . append ( tv ) ; } } Collection behs = UmlHelper . getHelper ( ) . getCore ( ) . getOperations ( cls ) ; if ( behs != null ) { sb . append ( '\n' ) ; sb . append ( INDENT ) . append ( "////<seq2seq4repair_space>Operations\n" ) ; Iterator behEnum = behs . iterator ( ) ; while ( behEnum . hasNext ( ) ) { MBehavioralFeature bf = ( ( MBehavioralFeature ) ( behEnum . next ( ) ) ) ; sb . append ( '\n' ) . append ( INDENT ) . append ( generate ( bf ) ) ; tv = generateTaggedValues ( ( ( MModelElement ) ( bf ) ) ) ; if ( ( ( cls instanceof MClass ) && ( bf instanceof MOperation ) ) && ( ! ( ( ( MOperation ) ( bf ) ) . isAbstract ( ) ) ) ) { sb . append ( '\n' ) . append ( INDENT ) . append ( "{\n" ) ; if ( ( tv . length ( ) ) > 0 ) sb . append ( INDENT ) . append ( tv ) ; sb . append ( generateMethodBody ( ( ( MOperation ) ( bf ) ) ) ) . append ( '\n' ) . append ( INDENT ) . append ( "}\n" ) ; } else { sb . append ( ";\n" ) ; if ( ( tv . length ( ) ) > 0 ) sb . append ( INDENT ) . append ( tv ) . append ( '\n' ) ; } } } <START_BUG> sb . append ( "}<seq2seq4repair_space>//*<seq2seq4repair_space>end<seq2seq4repair_space>" ) . append ( classifierKeyword ) . append ( '<seq2seq4repair_space>' ) . append ( generatedName ) . append ( "<seq2seq4repair_space>*//\n" ) ; <END_BUG> return sb . toString ( ) ; } public String generateMethodBody ( MOperation op ) { } public String generateDefaultReturnStatement ( MClassifier cls ) { } public String generateTaggedValues ( MModelElement e ) { } public String generateTaggedValue ( MTaggedValue tv ) { } public String generateConstraintEnrichedDocComment ( MModelElement me , MAssociationEnd ae ) { } public String generateConstraintEnrichedDocComment ( MModelElement me ) { } public String generateConstraints ( MModelElement me ) { } public String generateConstraint ( MConstraint c ) { } public String generateAssociationFrom ( MAssociation a , MAssociationEnd ae ) { } public String generateAssociation ( MAssociation a ) { } public String generateAssociationRole ( MAssociationRole m ) { } public String generateAssociationEnd ( MAssociationEnd ae ) { } public String generateGeneralzation ( Collection generalizations ) { } public String generateSpecification ( MClass cls ) { } public String generateClassList ( Collection classifiers ) { } public String generateVisibility ( MVisibilityKind vis ) { } public String generateVisibility ( MFeature f ) { } public String generateScope ( MFeature f ) { } public String generateAbstractness ( MOperation op ) { } public String generateChangeability ( MOperation op ) { } public String generateChangability ( MStructuralFeature sf ) { } public String generateMultiplicity ( MMultiplicity m ) { } public static final String ANY_RANGE = "0..*" ;

Fix:
sb . append ( "}<seq2seq4repair_space>//*<seq2seq4repair_space>end<seq2seq4repair_space>" ) . append ( classifierKeyword ) . append ( '<seq2seq4repair_space>' ) . append ( generatedName ) . append ( "<seq2seq4repair_space>*//\n?>" ) ;